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Ouch! Sounds like the Bendix on the starter motor could have been damaged, or possibly the starter relay. I'd check the relay first. With ignition and engine off. pull the small terminal on the relay terminal Labeled "S" for start. It is next to the Battery terminal. (See enlarged pix on the link below.) Next, try to start the engine. It should not even try. Then, reconnect the starter wire to the relay. Have a friend start the engine and then pull the wire from the "S" terminal. If pulling the wire kills he engine, the you probably have a bad ignition switch. If the starter motor is still engaged with engine running, then I'd suspect a stuck relay or stuck Bendix. Since the relay is the cheaper component of the two (10 to 25 bucks), I'd change the relay. If the relay doesn't remedy the situation, It's time to replace the starter/Bandix.

If the heater blower circuit was not connected to the bypass relays of the remote starter unit, then it will not work. Some lower grade aftermarket remote starters do not have relay bypass for the accessory circuits (heater and A/C) in order to save a buck or two. If it is a factory remote start, then the heater should work.

Be sure the AIR BAG/VATS fuse 10 amp, is good. there is a STARTER ENABLE RELAY up high on the left of the steering column. I ASSUME the anti theft light is not flashing?" at the STARTER ENABLE RELAY the YELLOW wire is hot in the crank mode and comes out large PURPLE to the starter. the small purple wire is hot in the crank mode if the fuse (air bag/vats) is good. the small yellow is grounded through the park switch and the VATS module (anti theft)

Many Toyotas have a problem with the large copper contacts in the starter solenoid.They get burnt and if they weld together, you'll have to take the battery cable off the battery to stop the starter.Pull the starter them remove and take apart the solenoid to find the contacts.Toyota does not sell solenoid contacts.Find a starter and alternator rebuilder in your area.I used to buy them for a buck a contact.

most starts only have to bolts..MAKE SURE TO TAKE THE BATTERY TERMINAL OFF FIRST..unbolt the starter and the wires to it..i have a shop close to my house that fixes starters and alternaters..usually about 5 or 10 bucks cause the brushes go bad..make sure u check the starter relay under the hood first as well as the soleniod either on the starter or somewhere in between..relays r about $10 and soleniods r about $20 or $30..if u hold ur ear to the relay while someone turns the key it will click..or u can pull it and put 12 volts through the coil side in it and test the switch side for continuity..the starter shop can tell u if the soleniod is bad..hope this helps u..i know how it is when times r tight..

Check the starter relay. It is in the distribution box under the hood on the driver's side. Of the two relays in the first row (towards the engine), it should be the relay on the right. It is a Heller 3614 relay.
You can get these at any good parts store, about 10-15 bucks.
If it's not the relay (check it like this: the relay next to it on the left is the same relay, used for the lighting circuit...swap them, and if it starts, but you don't have your lights, the relay is bad), move on to the ignition switch.
These are not fun, so pray it's the relay.

Could be ignition switch, battery/battery connection, starter, starter solenoid, or starter relay. (phew!) Remove your battery cables and clean the posts and terminals. (There's a really cheap and easy-to-use tool for this that works VERY well. Cheap as in 1-2 bucks.) Get your battery checked, too. Just in case. If you're pretty good with stuff like this, remove the ignition switch and hotwire it. If it starts every time, it's your switch. If not that, replace your starter relay. Cheap and easy. If not that, Get your starter/starter solenoid checked at a parts store for FREE. (You'll have to remove it, but most can DIY.) Good Luck.

remove black plastic relay cover in plastic underhood fuse box and activate relay with a very small screwdriver and ignition on. If starts, obviously the starter is fine, if not the starter is indeed bad and needs replacement so hold onto your ankles cuz it's gonna hurt.